Add SPI flash driver

This driver is taken from u-boot and adapted to match
coreboot. It still contains some hacks and is ICH specific
at places.

Change-Id: I97dd8096f7db3b62f8f4f4e4d08bdee10d88f689
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/997
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 268 insertions, 0 deletions

diff --git a/src/drivers/spi/sst.c b/src/drivers/spi/sst.c
new file mode 100644
index 0000000000..56cc851acf
--- /dev/null
+++ b/src/drivers/spi/sst.c
@@ -0,0 +1,268 @@
+/*
+ * Driver for SST serial flashes
+ *
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Copyright 2008, Network Appliance Inc.
+ * Jason McMullan <mcmullan@netapp.com>
+ * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <stdlib.h>
+#include <spi_flash.h>
+#include "spi_flash_internal.h"
+
+#define CMD_SST_WREN		0x06	/* Write Enable */
+#define CMD_SST_WRDI		0x04	/* Write Disable */
+#define CMD_SST_RDSR		0x05	/* Read Status Register */
+#define CMD_SST_WRSR		0x01	/* Write Status Register */
+#define CMD_SST_READ		0x03	/* Read Data Bytes */
+#define CMD_SST_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
+#define CMD_SST_BP		0x02	/* Byte Program */
+#define CMD_SST_AAI_WP		0xAD	/* Auto Address Increment Word Program */
+#define CMD_SST_SE		0x20	/* Sector Erase */
+
+#define SST_SR_WIP		(1 << 0)	/* Write-in-Progress */
+#define SST_SR_WEL		(1 << 1)	/* Write enable */
+#define SST_SR_BP0		(1 << 2)	/* Block Protection 0 */
+#define SST_SR_BP1		(1 << 3)	/* Block Protection 1 */
+#define SST_SR_BP2		(1 << 4)	/* Block Protection 2 */
+#define SST_SR_AAI		(1 << 6)	/* Addressing mode */
+#define SST_SR_BPL		(1 << 7)	/* BP bits lock */
+
+struct sst_spi_flash_params {
+	u8 idcode1;
+	u16 nr_sectors;
+	const char *name;
+};
+
+struct sst_spi_flash {
+	struct spi_flash flash;
+	const struct sst_spi_flash_params *params;
+};
+
+static inline struct sst_spi_flash *to_sst_spi_flash(struct spi_flash *flash)
+{
+	return container_of(flash, struct sst_spi_flash, flash);
+}
+
+#define SST_SECTOR_SIZE (4 * 1024)
+static const struct sst_spi_flash_params sst_spi_flash_table[] = {
+	{
+		.idcode1 = 0x8d,
+		.nr_sectors = 128,
+		.name = "SST25VF040B",
+	},{
+		.idcode1 = 0x8e,
+		.nr_sectors = 256,
+		.name = "SST25VF080B",
+	},{
+		.idcode1 = 0x41,
+		.nr_sectors = 512,
+		.name = "SST25VF016B",
+	},{
+		.idcode1 = 0x4a,
+		.nr_sectors = 1024,
+		.name = "SST25VF032B",
+	},{
+		.idcode1 = 0x4b,
+		.nr_sectors = 2048,
+		.name = "SST25VF064C",
+	},{
+		.idcode1 = 0x01,
+		.nr_sectors = 16,
+		.name = "SST25WF512",
+	},{
+		.idcode1 = 0x02,
+		.nr_sectors = 32,
+		.name = "SST25WF010",
+	},{
+		.idcode1 = 0x03,
+		.nr_sectors = 64,
+		.name = "SST25WF020",
+	},{
+		.idcode1 = 0x04,
+		.nr_sectors = 128,
+		.name = "SST25WF040",
+	},
+};
+
+static int
+sst_enable_writing(struct spi_flash *flash)
+{
+	int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
+	if (ret)
+		printk(BIOS_WARNING, "SF: Enabling Write failed\n");
+	return ret;
+}
+
+static int
+sst_disable_writing(struct spi_flash *flash)
+{
+	int ret = spi_flash_cmd(flash->spi, CMD_SST_WRDI, NULL, 0);
+	if (ret)
+		printk(BIOS_WARNING, "SF: Disabling Write failed\n");
+	return ret;
+}
+
+static int
+sst_byte_write(struct spi_flash *flash, u32 offset, const void *buf)
+{
+	int ret;
+	u8 cmd[4] = {
+		CMD_SST_BP,
+		offset >> 16,
+		offset >> 8,
+		offset,
+	};
+
+	printk(BIOS_SPEW, "BP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
+		spi_w8r8(flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
+
+	ret = sst_enable_writing(flash);
+	if (ret)
+		return ret;
+
+	ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), buf, 1);
+	if (ret)
+		return ret;
+
+	return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+}
+
+static int
+sst_write(struct spi_flash *flash, u32 offset, size_t len, const void *buf)
+{
+	size_t actual, cmd_len;
+	int ret;
+	u8 cmd[4];
+
+	ret = spi_claim_bus(flash->spi);
+	if (ret) {
+		printk(BIOS_WARNING, "SF: Unable to claim SPI bus\n");
+		return ret;
+	}
+
+	/* If the data is not word aligned, write out leading single byte */
+	actual = offset % 2;
+	if (actual) {
+		ret = sst_byte_write(flash, offset, buf);
+		if (ret)
+			goto done;
+	}
+	offset += actual;
+
+	ret = sst_enable_writing(flash);
+	if (ret)
+		goto done;
+
+	cmd_len = 4;
+	cmd[0] = CMD_SST_AAI_WP;
+	cmd[1] = offset >> 16;
+	cmd[2] = offset >> 8;
+	cmd[3] = offset;
+
+	for (; actual < len - 1; actual += 2) {
+		printk(BIOS_SPEW, "WP[%02x]: 0x%p => cmd = { 0x%02x 0x%06x }\n",
+		     spi_w8r8(flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
+		     offset);
+
+		ret = spi_flash_cmd_write(flash->spi, cmd, cmd_len,
+		                          buf + actual, 2);
+		if (ret) {
+			printk(BIOS_WARNING, "SF: SST word program failed\n");
+			break;
+		}
+
+		ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+		if (ret)
+			break;
+
+		cmd_len = 1;
+		offset += 2;
+	}
+
+	if (!ret)
+		ret = sst_disable_writing(flash);
+
+	/* If there is a single trailing byte, write it out */
+	if (!ret && actual != len)
+		ret = sst_byte_write(flash, offset, buf + actual);
+
+ done:
+	printk(BIOS_INFO, "SF: SST: program %s %zu bytes @ 0x%lx\n",
+	      ret ? "failure" : "success", len, offset - actual);
+
+	spi_release_bus(flash->spi);
+	return ret;
+}
+
+static int sst_erase(struct spi_flash *flash, u32 offset, size_t len)
+{
+	return spi_flash_cmd_erase(flash, CMD_SST_SE, offset, len);
+}
+
+static int
+sst_unlock(struct spi_flash *flash)
+{
+	int ret;
+	u8 cmd, status;
+
+	ret = sst_enable_writing(flash);
+	if (ret)
+		return ret;
+
+	cmd = CMD_SST_WRSR;
+	status = 0;
+	ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &status, 1);
+	if (ret)
+		printk(BIOS_WARNING, "SF: Unable to set status byte\n");
+
+	printk(BIOS_INFO, "SF: SST: status = %x\n", spi_w8r8(flash->spi, CMD_SST_RDSR));
+
+	return ret;
+}
+
+struct spi_flash *
+spi_flash_probe_sst(struct spi_slave *spi, u8 *idcode)
+{
+	const struct sst_spi_flash_params *params;
+	struct sst_spi_flash *stm;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(sst_spi_flash_table); ++i) {
+		params = &sst_spi_flash_table[i];
+		if (params->idcode1 == idcode[2])
+			break;
+	}
+
+	if (i == ARRAY_SIZE(sst_spi_flash_table)) {
+		printk(BIOS_WARNING, "SF: Unsupported SST ID %02x\n", idcode[1]);
+		return NULL;
+	}
+
+	stm = malloc(sizeof(*stm));
+	if (!stm) {
+		printk(BIOS_WARNING, "SF: Failed to allocate memory\n");
+		return NULL;
+	}
+
+	stm->params = params;
+	stm->flash.spi = spi;
+	stm->flash.name = params->name;
+
+	stm->flash.write = sst_write;
+	stm->flash.erase = sst_erase;
+	stm->flash.read = spi_flash_cmd_read_fast;
+	stm->flash.sector_size = SST_SECTOR_SIZE;
+	stm->flash.size = stm->flash.sector_size * params->nr_sectors;
+
+	/* Flash powers up read-only, so clear BP# bits */
+	sst_unlock(&stm->flash);
+
+	return &stm->flash;
+}